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FCPS part 1 Medicine solved mcqs with explanation Q24

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Thymus is derived from:
a) 4th Pharyngeal pouch
b) 2nd pharyngeal pouch
c) 3rd pharyngeal pouch
d) Tuberculum impar

Correct Answer: c

Explanation:
Derivatives of pharyngeal pouches:
  • 1st pouch: Middle ear cavity, Eustachian tube, mastoid air cells
  • 2nd pouch: epithelial lining of palatine tonsil
  • 3rd pouch: inferior parathyroid gland + thymus
  • 4th pouch: superior parathyroid gland
NOTE: It might seem strange that the inferior parathyroid glands arise from the 3rd pouch while the superior parathyroid glands arise from the 4th pouch. But this is how it is.
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